NMR Facility


The Magnex magnet on the right has pneumatic legs for vibration damping. There is a pneumatics controller behind the magnet and the RF preamp unit to the left of the magnet. The system electronics console is on the left.

The system has the standard Varian low temperature accessory which will go down to about -110° C for short term experiments, and an extended low temperature accessory that will permit operation down to -150° C for longer periods without operator intervention.

The console is equipped with four broadband RF channels, each covering the full frequency range of 500 MHz down to 10 MHz, and each equipped with a waveform generator. The waveform generators allow a shaped pulse or custom decoupler modulation scheme on all four channels. All four channels are also equipped with linear amplifiers, permitting peak pulse power to be varied over 79 db range. There is also a 30 G/cm Pulsed Field Gradient amplifier installed in this console.

The system is equipped with two different probes. The probe used most often is a 5mm 1H/19F/13C/31P quad resonance probe. This is a proton/fluorine observation probe with both Carbon and Phosphorus decoupling coils suitable for observation as well. A Z-axis PFG coil allows for PFG experiments and gradient shimming.

The second probe is a 5 mm broadband probe, with Proton and Fluorine decoupling capability, covering the 50-202 MHz frequency band (N-15 through P-31). This probe also includes a PFG coil.

The RF Front End includes four preamplifiers, two high band and two low band, permitting wide flexibility in designing multiple nucleus decoupling experiments. For example, it is possible with the quad probe to run experiments such as 1H{19F}{31P} or 13C{1H}{19F}{31P}, without any recabling.

The host computer is a Dell Optiplex 755 running RHEL 5.1 and Vnmrj 2.3A.